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Feb 29, 2004 - 25 posts - ‎13 authors
The timing chain setup on a VR6 consists of an upper and lower chain. ... with an "improved" setup consisting of a single-row chain, a single-piece, ... (Note: Torque specs given in this DIY are from the MKIV Bentley manual ...

The LEFT photo is of the 1979 and later SIMPLEX chain (one row of chain rollers). ...and this means the engine will not develop its designed torque and power curve. The ignition timing gets sloppy from, firstly, the chain guide/tensioner initial ...

Install a bolt in the end of the crankshaft
CAUTIONDo not install the crankshaft balancer bolt or a bolt longer than 1 inch or damage to the crankshaft threaded hole will result.

Rotate crankshaft until the number 1 piston is at Top Dead Center of compression stroke.

Make sure that the alignment marks are aligned with the tabs on the timing chain tensioner.

Measure distance between hole in bracket and unworn surface of timing chain tensioner shoe.
NOTE: If distance between the hole and unworn surface of timing chain tensioner is greater than 0.314 in (8 mm), replace tensioner, timing chain and sprockets.

Remove timing chain tensioner bolts.

Remove the timing chain, timing chain tensioner and camshaft sprocket at the same time.

Remove the crankshaft sprocket using special tool J 22888-20A or equivalent.

Remove crankshaft sprocket alignment key.

NOTE: If any camshaft components are being replaced to correct a noise problem, all camshaft drive components must be replaced.To Install:

Install the crankshaft sprocket alignment key.

Install the crankshaft sprocket using special tool J 5590 or equivalent.

Compress the timing chain tensioner spring and insert a pin into the tensioner hole to retain the tensioner shoe.

yes the silverado's have timing chains, just about all v6's and v8's have timing chains, and timing chains should not be serviced, unless you are having problems with a timing chain guide or timing chain tensioner

You change the timing chain now when your Jeep has indicated from a check engine light on. The timing chain in engines these days last as long as the engine will, there is a timing chain tensioner to ensure there is no slack.
When the timing chain has gotten stretched to much, your Jeeps PCM will indicate that with a check engine light on your dash and will be indicated with a DTC codes from a scanner.
So no worries about replacing your timing chain and keep up the regular maintenance, if you have a Mechanic tell you other wise, there just looking for money and your looking for more then just a timing chain being replaced.
You can bet that chain, chain tensioner, timing gears, water pump and might even throw in a cam replacement will be in his recommendation.
Thank you for using fixya and be safe.